Blower for vacuum cleaners



. Dec. 7, 1937.

E. GORISSEN BLOWER FOR VACUUM CLEANERS Filed Feb. 20, 1936 INVENTOR.

.E'. Gorv'sson Patented Dec. 7, 1937 UNITED STATES PATENT OFFICE BLOWERFOR VACUUM CLEANERS Engelbert Gorissen,

Wuppertal-Barmen,

Ger-

Germany Application February 20, 1936, Serial No. 64,987 In GermanyMarch 1, 1935 1 Claim.

This invention relates to a blower for vacuum cleaners, in which arapidly revolving wheel set with blades or vanes draws in air bysuction, and forces it into a dust bag through an-air outlet connectionbranching ofi radially or tangentially at anyconvenientangleofinclinationto the plane of rotation of the vane wheelor fan. In blowers of this kind the fan or its vane-carrying disc hashitherto been at right angles to the axis of the fan, which has theresult thatthe air,flowing away from the fan just at the point ofconnection to the air outlet branch, enters the inclined connectionbranch more or less in the direction oi. the plane of rotation of thefan, and consequently, when it impinges upon the wall thereof, itundergoes a sudden change of direction. Eddies and obstructions arisingtherefrom in the outflowing current of air give rise to losses of head,which considerably diminish the efliciency of the blower.

The object of this invention is to obviate this disadvantage, and forthis purpose the invention consists in adapting the shape of the fan tothe direction of flow of the escaping air, which is determined by theinclination of the air outlet connection. This is preferably efiected byraising the marginal portion of the fan or of its vanecarrying disc atthe same or approximately the same angle of inclination as the airoutlet connection. With such a. construction of the fan the air flowingaway from the fan at the place of connection of the outlet branchimmediately assumes the direction of the said branch, and therefore doesnot undergo any change of direction in the latter. The result of this isa considerable increase in the efiiciency of the blower, having regardto the quantity of air delivered, since the eddies and throttlings ofthe air currents, which occasion flow losses in the connecting branch,are eliminated.

Four forms of construction of the new blower, in conjunction with amanually operated vacuum cleaner, are illustrated in axial section inFigures 1 to 4 of the accompanying drawing.

In the drawing, a is the blower casing, with a suction nozzle or brush bexchangeably arranged either directly on the casing or on a separatesuction connection, and an air outlet connection 0, which branches offfrom the casing a at any convenient angle of inclination :c to the planeof rotation of the fan or vane wheel 1. In the manually operated vacuumcleaners illustrated, the air outlet branch 0, to which a dust bag, notshown, is directly connected, serves at the same time as a handle. Thefan, consisting of blades 1 secured to a substantially conical disc 9,is mounted upon the shaft e of an electric motor d, and is so arrangedwith the motor in the casing, that between the fan and the peripheralwall of the casing an air-guiding passage or diffuser 2' is obtained.The diffuser passage may extend parallel to the fan right to the airoutlet connection, or else may ascend helically at an angle ofinclination which is equal or approximately equal to that of the airoutlet connection 0, as shown in Figure 1.

According to the invention the shape of the fan is adapted to thedirection of flow of the air discharged thereby, which is determined bythe inclination a: of the air outlet branch c. In the constructionalexamples illustrated the fan I or its vane-carrying disc g ascendsuniformly towards the margin at the same angle of inclination 1:, asshown in Figure 2, or at approximately the same angle, as shown inFigure 1, as the air outlet connection 0, as a result of which the airflowing from the fan directly into the outlet con nection is from theoutset directed in a direction of flow which is adapted to the angle ofinclination a: of the outlet branch.

The ascending portion of the fan disc 9 need not necessarily berectilinear, as shown in Figures 1 and 2, but may alternatively ascendin a more or less curved line, as shown in Figure 3, or else in steps,as shown in Figure 4.

The vanes or blades f of the fan, on the side opposite to the carryingdisc 9, may still extend at right angles to the axis of rotation, asshown in Figures 1, 2, and 3, or else, on this side also, may beinclined upwards and outwards to a greater or less extent, asillustrated in Figure 4, to correspond to the inclination of thecarrying disc.

The applicability of the invention is not restricted to theconstructional forms of manually operated vacuum cleaners shown, but mayequally well be applied to other types of vacuum cleaner, such as potvacuum cleaners and the like, with the same success, in so far as theair outlet connection branches off at an inclination to the plane ofrotation of the fan. I

What I claim is:-

A blower for hand vacuum cleaners, comprising a casing, a substantiallyconical blade-carrying disc rotatably mounted in the casing, bladessecured to the said disc to form a fan, and an air outlet connectionbranching ofi from the casing at an angle to the plane of rotation ofthe fan, the upper boundary of the inclined air outlet connection lyingapproximately in a continuation of the conical surface of which theblade-carrying disc forms a part.

ENGELBERT GORISSEN.

